Questions 7 to 8 are based on the following news. At the end of the news item, you will be given 10 seconds to answer each of the two questions.
Now listen to the news.
Humans can distinguish about ______.

A．international trade should be expanded
B．the interests of the poor countries have not been given enough consideration
C．the exports of the poor countries should be increased
D．communications technology in file developing countries should be modernized

A．doubled
B．reached to $ 7 trillion
C．increased four times
D．increased by $ 7 trillion